Metal mold for piston castings



June R2, 11923. 1 M58343 -G; R. KELM METAL Mow FOR PISTON CASTINGS Filed A g- 24 1922 j 5 Sheets-Sheet 1 Jun e T12, 192.3. 3 453343:

G. R. KELM METAL MOLD FOR PISTON CASTINGS Filed mg. 24 1922 s Sheets-Sheet 2 June 112., 11923.

G. R' KELM I METAL MOLD FOR PISTON CASTINGS Filed A' g. 24 1922 3 Sheets-Sheet 5 otented Jlnne l2,

GUSTAV KELIE, YORK, N. 1., ASSIGNOB T0 W. M. LEVETT AND WALKER 1L1.

NEW YORK, N. Y., A CORPORATION 035' NEW YORK.

LEVWT 00., 0E

@FFHQE sin-Ten MOLD- soie sess on essences.

Application filed August 24, 1922. Serial Ito. 584,001.

To all whom it may concem:

Be it known that I, GUsTAv citizen of the Polish Republic, residi g in the city, county, and State of New ork, have invented new and useful Improvements R. Kern a in Metal Wolds for Piston Castings, of which the following is a specification, reference being had to the accompanying drawings, in which Fig. l is a section of a piston mold cinbodying my invention; Fig. 2 is a, plan thereof Fig. 3 is an elevation of a half mold showing the piston cavity; and 5 are sections on lines and 5- 5, respectively, of Fig. 1; and Fig. 6 is detailshowing the locking mechanism for holding, t e mold halves together.

My invention relates to metal molds, and particularly to molds used for casting pictons, consisting predominantly of aluminum. My invention comprises an arrangement of core pieces which permits ready assemblage of the mold and. its core parts and greatly incilitates the separation of the mold from the piston. My invention also comprises the various features which I shall hereinafter describe and claim.

Referring to the drawings 2 indicates the two complementary halves of a metal mold constructed to form a piston casting A of the desired shape, such as a skirted or cup shaped niston, for internal combustion engines. Each half mold 2 has a semi-circular recess 3 which extends from the top of half mold to its bottom, forming the passage through which the core pieces are inserted and withdrawn. The lower portions of the recesses 3 are offset at 3 and form the top and outer side walls of the mold cavity. The mold halves 2 are mounted on a metal member 4 the central portion 5 oi which forms the bottom of the mold cavity. The handles 6 are secured to halves 2., so to permit the movement of these parts upon the base l into and out oi c n ihe niold core is "pref a plurality metal. ir form her illustrated cc men-shes 8, which forms i opposite cnrvec mold cavity and on each of the two opposite sides of theinain section 8 (between the curved walls 9) and extend to the lower portion of the cavity,

terminating in laterally extending projections lQ, thus forming with the lower portion of the main section 8 the inner config- -oration of the'cavity from the bottom of the cavity to the upper edge of the piston bosses; and in two'sections13, one of which is arranged, outside each ,set of two of the sections 11 and completes with the portions 9 of the main section 8 the inner circumference of the cavity above the piston bosses. The lower end each section 13 also forms the upper side of the web oi the piston boss poi ions oi cavity and has a bearing upon e up lltiG an inward projection 15, v culer opening therein for the pin hoss 26.

inc-ids nre' 'iei'atory to mold halves ere moved tothe base 4. and are lock-ed 1v hes The two core i supportei; hy the levin the dotted line posie 5 1., next insii ,5; the levers 25,

, ',siiion the top by the project out vardly over the d. and at the bottom by their i the upper sides of the procore section 11 are then the sections 1 and moved. owei ends nether ouch o The core two sets movedby its handle 23; thefour sections 11 are then moved by theirhandles 24: laterally and inwardly to free their. lower ends 12 from the piston bosses 26 and any ribs which may form part of the casting which project from the sides toward the interior of the casting, and are then drawn upwardly; and,

' finally, the levers 25 which are attached. to

the core sections 13 arev depressed and the core sections 13 are thus elevated until their lower ends are clear of the skirt of the casting. The mold is then opened and the cast-,

ing removed without the necessity of taking out the core pieces 13. 1 U

lln caseany of the core sections are frozen in, they may be freed by manipulation ofthe levers 25, as the flanged portions of the sec tions l3 underlie the extensions of the parts and hence, when .the'levers, are depressed, the l-'thus- -be broken away parts 119 and 13 'Wll from the casting.

' l have foundjthat molds constructed in accordance --.with my invention can be operated with great rapidity, since it, isfonly necessary to elevate and'not to remove the core pieces 12% 'lhfm results ina cons derable savingoi time both-in'assembling the lents of the features shown and described,

or portions thereoih-bu't recognize that various structural modifications are possible within the scope of the invention claimed.

What I claim is: v 1. in permanent molds for casting skirted pistons, a combination of a support, a pair of permanent mold members mounted on said support and movable bodily upon said support toward and away from each other,

said mold members being tormedwith com- I said recesses.

nesame plementary vcurved walls comprising outer walls of a mold cavity for casting a skirted piston therein, a permanent sectional core comprising a plurality of sections supported fromthe top of the mold member and forming the interior side walls thereof, and levers attached to certain of such core sec- .tions co-operatingwith the top of the mold member to reciprocate the last mentioned core sections into and out of casting. position. -2. In permanent molds for casting pistons, a combination of a support, a pair of permanent mold members mounted on said support and each having a recess complementary' to the-recess on the other member to "form the exterior of a mold cavity in which a piston is-to be cast, a permanent core membenmovable relative to and spaced from said'outer cavityv walls to term inner walls of the mold cavity, said core being comprised of inner-sections and outer sections,

the outer sections being capable of being elevated and loweredinto and out of casting position, and means cooperating with the top of the mold members for soraising and lowering the said core sections.

3. line permanent piston mold, a pair of mold members having complementary recesses on the inner faces thereof to form the outer side wall of a piston mold cavity, a permanent core mounted-between said complementary walls to form the inner wall of the cav1ty,'said permanent core being comprised of a main section and puter sections 1 forming a portion of the inner wall of the mold cavity and a portion of the top edge thereof, said outer core sections having a bearing on the mold sections below-the top vof the cavity when in casting position, and

means for elevating the said core sections abovethe top of the casting after pouring to permit the removal of the casting without withdrawal of the core sections from the ensrava. enn. 

